code: def read_param_file(
      fs: "FileSystem",
      path: str,
      key_paths: Optional[List[str]] = None,
      flatten: bool = False,
      **load_kwargs,
  ) -> Any:
      config = load_path(path, fs, **load_kwargs)
      if not key_paths:
          return config
  
      ret = {}
      if flatten:
          for key_path in key_paths:
              try:
                  ret[key_path] = dpath.get(
                      config, key_path, separator="."
                  )
              except KeyError:
                  continue
          return ret
  
      from copy import deepcopy
  
      from dpath import merge
      from funcy import distinct
  
      for key_path in distinct(key_paths):
          merge(
              ret,
              deepcopy(dpath.search(config, key_path, separator=".")),
              separator=".",
          )
      return ret
  
imports: import os
  import typing
  from collections import defaultdict
  from typing import TYPE_CHECKING, Any, Dict, List, Optional
  import dpath
  from dvc.exceptions import DvcException
  from dvc.log import logger
  from dvc.utils.serialize import ParseError, load_path
  from dvc_data.hashfile.hash_info import HashInfo
  from .base import Dependency
label_desc: Use image node_id 1 for calling a global function with example usage: read_param_file(fs, path, key_paths, flatten) and returns: ret, config, ret